/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package com.sun.org.apache.xml.internal.security.utils;

import java.io.OutputStream;

/**
 * A simple Unsynced ByteArrayOutputStream
 *
 * @author raul
 */
public class UnsyncByteArrayOutputStream extends OutputStream {

  private static final int INITIAL_SIZE = 8192;

  private byte[] buf;
  private int size = INITIAL_SIZE;
  private int pos = 0;

  public UnsyncByteArrayOutputStream() {
    buf = new byte[INITIAL_SIZE];
  }

  public void write(byte[] arg0) {
    if ((Integer.MAX_VALUE - pos) < arg0.length) {
      throw new OutOfMemoryError();
    }
    int newPos = pos + arg0.length;
    if (newPos > size) {
      expandSize(newPos);
    }
    System.arraycopy(arg0, 0, buf, pos, arg0.length);
    pos = newPos;
  }

  public void write(byte[] arg0, int arg1, int arg2) {
    if ((Integer.MAX_VALUE - pos) < arg2) {
      throw new OutOfMemoryError();
    }
    int newPos = pos + arg2;
    if (newPos > size) {
      expandSize(newPos);
    }
    System.arraycopy(arg0, arg1, buf, pos, arg2);
    pos = newPos;
  }

  public void write(int arg0) {
    if ((Integer.MAX_VALUE - pos) == 0) {
      throw new OutOfMemoryError();
    }
    int newPos = pos + 1;
    if (newPos > size) {
      expandSize(newPos);
    }
    buf[pos++] = (byte) arg0;
  }

  public byte[] toByteArray() {
    byte result[] = new byte[pos];
    System.arraycopy(buf, 0, result, 0, pos);
    return result;
  }

  public void reset() {
    pos = 0;
  }

  private void expandSize(int newPos) {
    int newSize = size;
    while (newPos > newSize) {
      newSize = newSize << 1;
      // Deal with overflow
      if (newSize < 0) {
        newSize = Integer.MAX_VALUE;
      }
    }
    byte newBuf[] = new byte[newSize];
    System.arraycopy(buf, 0, newBuf, 0, pos);
    buf = newBuf;
    size = newSize;
  }
}
